sapling tree gen problems 2.8
I have found many interesting things
objects supposedly not being invisible in RenderLayer were not visible in any view, moreover, in the outliner. I tried searching for them by trying to append anything, from another .blend blank file. I suprisingly found that a lot of mesh data was in the scene, but it wasn't connected to any object, thus confusing the add on py's. After cleaning not used, hidden mesh data, add on started working properly.